ISiMNJEIDJE OF NORTH AMERICA. 303 



Limn&a palustris var. nuttalliana WOOD, Nautilus, p. 56, 1891. KEEP, West. 

 Amer. Sh., p. 314, 1904. 



Limnophysa palustris var. nuttalliana COOPER, Zoe., I, p. 196, 1890. 



Lymncea palustris. var. nuttalliana DALL, Alaska Moll., p. 76, fig. 57, 1905. 



Lymncea palustris nuttalliana BERRY, Nautilus, XXI, p. 123, 1908. 



Lymnea haydeni LEA, Proc. Phil. Acad., 1858, p. 166; Exp. in Nebraska, 

 II, pt. 3, p. 724, 1859. Journ. Phil. Acad., VI, pp. 159, 161, pi. 34, fig. 73, 1866; 

 Obs., pp. 115, 117, pi. 34, fig. 73, 1867. SCUDDER Bull. Nat. Mus., 23, pp. 82, 

 149, 201, 1885. ROBERTS, Rep. U. S. Geol. Surv. Wyoming, 1871, p. 468. 



Limnea haydeni INGERSOLL, Bull. U. S. Geol. & Geog. Surv., I, p. 138, 1875 ; 

 Rep. U. S. Geol. & Geog. Surv. Terr., 1876, p. 405. 



Limncea haydeni BINNEY, Check List, p. 12, 1860; L. & F. W. Sh. N. A., 

 II, p. 44, fig. 59, 1865. TRYON, Con. Hald. Mon., p. 98 (72), pi. 17, fig. 6, 1872. 

 WALKER, Nautilus, VI, p. 33, 1892; Rev. Moll. Mich., 1894, -pp. 18, 22. 



Limnophysa haydeni TRYON, Amer. Journ. Conch., I, p. 251, 1865. CALL, 

 Bull. Wash. Coll. Lab. N. H., I, p. 52, 1885. 



Limnaus haydeni CLESSIN, KUSTER, Conch. Cab., p. 390, taf. 53, pi. 10, 1886. 



Limncea sumassi TRYON, Con. Hald. Mon., p. 97 (71), pi. 17, fig. 5, 1872. 

 INGERSOLL, Bull. U. S. Geol. & Geog. Surv., I, p. 138, 1875; Rep. U. S. Geol. & 

 Geog. Surv. Terr., 1874, p. 405, 1876. 



Limn&a near sumassi PILSBRY, Nautilus, XVII, p. 84, 1903. (?) 



Limnophysa sumassi CALL, Bull. U. S. Geol. Surv., II, pp. 371, 403, 1884; 

 Bull. Wash. Coll. Lab. N. H., I, p. 52, 188*5. GILBERT, Mon. U. S. Geol. Surv., I, 

 pp. 210, 300, 1890. 



Lymnaa sumassi HENDERSON, Univ. Col. Studies, IV, p. 180, 1907. 



Limnophysa palustris var. sumassi COOPER, *An. Rep. Cal. State Min. Bu., 

 VI, p. 245, 1888. 



Lymncea catascopium var. sumassi DALL, Alaska Moll., p. 78, 1905 (part). 



Limnea 1 ?!NGERSOLL, Bull. U. S. Geol. & Geog. Surv., I, p. 138, 1875; Rep. 

 U. S. Geol. & Geog. Surv. Terr., 1874, p. 405, 1876. 



Limnaa rowelli CKLL., Journ. Conch., VI, p. 64, 1889. 



Limncea vahlii ?WHITEAVES, Ottawa Nat., XX, p. 117, 1906. 



Lymnaa rowelli HENDERSON, Univ. Col. Studies, IV, p. 184, 1907. 



Limncea tryoniana ?SINGLEY, Rep. Geol. Surv. Texas, IV, p. 188, 1892; 

 p. 314, 1893. 



Limnaa palustris michiganensis BAKER, Trans. Acad. Sci. St. Louis, XI, 

 p. 17, pi. i,'fig. 5, 1901 (part). Moll. Chi. Area, p. 276, pi. 32, fig. 5, 1902 (part). 

 BLATCHLEY and DANIELS, 27 Rep. Dept. Geol. Nat. Res. Ind., p. 596, 1903 

 (part). DANIELS, 1. c., p. 636 (part). 



Limn&us sordidus KUSTER, in MART. & CHEMN., Syst. Conch. Cab., ed. 2, 

 Limnseus, p. 58, taf. 12, figs. 15, 16, 1862. VON MARTENS, Biol. Cent. Amer. 

 Moll., p. 379, 1899. 



Limnata zebra, TAYLOR (non TRYON), vide WALKER, in letter. 



SHELL: Varying from elongate to elongate-ovate, usually rather 

 thin; color varying from pale brown to almost jet black; surface dull 



says "near L. Rowelli Tryon, 'Dr. James Lewis in letter'." These 

 were probably narrow forms of palustris, or possibly elodes. Rowelli has not 

 been recorded authentically from Colorado. The same may be said of the 

 record of Prof. Cockerell. 



